Installation Instructions
DS-50D Disconnect Switch
for Model HD3D Unit Heaters
1
PF928
161-305521-003
August 2014
2
Warnings
Failure to understand and follow these instructions and
the “WARNING” notes therein may result in serious
personal injury from electrical shock, or from the heater
falling due to faulty installation.
ELECTRIC SHOCK HAZARD. Any installation
involving electric heaters must be performed
by a qualified person and must be effectively grounded in accordance with the National
Electrical Code to eliminate shock hazard.
ELECTRIC SHOCK HAZARD. Disconnect all
power before installing or servicing heater.
Failure to do so could result in personal injury
or property damage. Heater must be installed
by a qualified person in accordance with the
National Electrical Code, NFPA 70.
Package Contents
Item
Quantity
Part Number
Description
A
1
304873006
Disconnect Switch Cover Assembly
B
1
304873006
Disconnect Housing Assembly
C
1
058038016
Slotted Mounting Bracket
D
1
058038015
Base Mounting Bracket
3
Item
Quantity
Part Number
Description
E
2
048849058
1 1/2" long 8-32 Machine Screw
F
8
048849023
5/8" long 10-32 Machine Screw
G
4
049592055
8-32 K-nuts
H
2
049592058
10-32 K-nuts
I
1
305629016
Ground wire, 10 Gauge, green
J
3
029205016
Power wires, 8 Gauge, black
K
4
075456007
1 1/4 conduit nipple
L
4
075572002
10-32 lock washers
M
1
010712053
Gasket
4
Disconnect Switch Installation
Note: Fasteners should be tightened according to
standard torque specs for stainless steel fasteners.
4. Place Neoprene gasket (Item M) over conduit nipple on outside of control panel housing.
1. Loosen two (2) capture screws and open hinged
front cover of control panel.
5. Screw conduit nipple (Item K) into conduit on Disconnect Housing Assembly (Item B) so that the
Disconnect Housing Assembly extends toward the
back of the heater. Do not fully tighten.
2. Remove Disconnect Switch Cover Assembly (Item
A) from Disconnect Housing Assembly (Item B) by
loosening four (4) capture screws.
3. Insert conduit nipple (Item K) into knockout from
inside of control panel.
6. Place lock washers on 1-1/2 x 8-32 machine screws
(Item E) and insert into Disconnect Housing Assembly.
5
7. Place Base Mounting Bracket (Item D) on two machine screws between remaining lock-washers and
8-32 k-nuts (Item G) and fully tighten.
9. Attach Slotted Mounting Bracket (Item C) to Base
Mounting Bracket by inserting (2) 5/8 x 10-32 machine screws (Item F) through slots and into threaded holes. Secure using remaining 8-32 k-nuts (Item
G). Fully tighten.
8. Secure Slotted Mounting Bracket (Item C) to heater
frame using (2) 5/8 x 10-32 machine screws (Item
F). Fully tighten.
Note: There are 4 threaded holes on the Base Mounting Bracket to allow for assembly to be installed on
different heater housing sizes. 2-20kW heaters should
use threaded holes farthest from the L-bend in the
bracket and 25-39kW heater should use holes closest
to the L-bend.
10.Fully tighten conduit nipple using 1-3/4” wrench
6
Disconnect Switch Wiring
11.Feed black and green jumper wires through disconnect enclosure and into control enclosure.
13.Install black jumper wires into disconnect terminals.
14.With disconnect installed, incoming power should
be routed through disconnect enclosure conduit
opening. Power wires should be installed in the remaining disconnect terminals and the ground wire
should be spliced to the ground jumper wire using
a wire nut.
12.Connect black jumper wires to contactor terminals
and green jumper wire to ground lug.
7
Elements
Part Number
Description
Item
010712053
Gasket
M
304873006
TERMINAL BOX-DIS. SWITCH
A&B
048849023
5/8 x 10-32 Machine Screws
F
075572002
10-32 Lock Washers
L
075456007
1 1/4 Conduit Nipple
K
049592055
8-32 K-Nuts
G
048849058
1 1/2 x 8-32 Machine Screws
E
058038016
Slotted Mounting Bracket
C
058038015
Base Mounting Bracket
D
029205016
8 Gauge Black Power Jumper Wires
J
305629016
10 Gauge Green Ground Jumper Wire
I
049592058
10-32 K-Nuts
H
Limited Warranty:
Please refer to the Chromalox limited warranty applicable to this product at
http://www.chromalox.com/customer-service/policies/termsofsale.aspx.
© 2014 Chromalox, Inc.
Chromalox, Inc.
1347 Heil Quaker Boulevard
Lavergne, TN 37086
8
(615) 793-3900
www.chromalox.com